Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-01-04
Phys. Rev. E 71, 051406 (2005)
Physics
Condensed Matter
Soft Condensed Matter
10 pages, 4 figures
Scientific paper
10.1103/PhysRevE.71.051406
An extension of the Asakura-Oosawa-Vrij model of hard sphere colloids and non-adsorbing polymers, that takes polymer non-ideality into account through a repulsive stepfunction pair potential between polymers, is studied with grand canonical Monte Carlo simulations and density functional theory. Simulation results validate previous theoretical findings for the shift of the bulk fluid demixing binodal upon increasing strength of polymer-polymer repulsion, promoting the tendency to mix. For increasing strength of the polymer-polymer repulsion, simulation and theory consistently predict the interfacial tension of the free colloidal liquid-gas interface to decrease significantly for fixed colloid density difference in the coexisting phases, and to increase for fixed polymer reservoir packing fraction.
Schmidt Matthias
Vink Richard L. C.
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